Abstract
The admittance model for the three-phase AC micro-grid is proposed in the paper considering the imbalance of the local load and active compensation of the multi-functional grid-connected inverter (MFGCI). By adopting complex variables, the model unified the positive-sequence and negative-sequence admittances for both the grid-connected inverter and the load. Moreover, the dq transformation based imbalance compensation algorithm is integrated into the model according to the harmonic linearization principle. The theoretical analysis and simulation verify the accuracy of the proposed admittance model. The analysis also indicates that while the adoption of the active compensation can decrease the imbalance of the system, the magnitude and phase characteristics of the equivalent admittance of the compensated load are significantly changed. The admittance model proposed in this paper can be the foundation work for the system stability study for the AC micro-grid.
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